GOODWILL AND INTANGIBLE ASSETS - Summary of Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets			$ 115,763
Accumulated Amortization	$ (50,028)	$ (50,028)	(41,360)
Net Intangible Assets	133,841	133,841	74,403
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Intangible Assets	186,769	186,769
Accumulated Amortization	(50,028)	(50,028)	(41,360)
Net Intangible Assets	136,741	136,741	74,403
Tradename
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived trademark	2,900	2,900
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	104,751	104,751	93,811
Accumulated Amortization	(35,277)	(35,277)	(30,103)
Net Intangible Assets	69,474	$ 69,474	$ 63,708
Amortization Period		10 years	10 years
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Accumulated Amortization	(35,277)	$ (35,277)	$ (30,103)
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	68,281	68,281	15,281
Accumulated Amortization	(10,406)	(10,406)	(7,876)
Net Intangible Assets	57,875	57,875	7,405
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Accumulated Amortization	(10,406)	$ (10,406)	$ (7,876)
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period		7 years	7 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period		15 years	15 years
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	200	$ 200
Accumulated Amortization	(100)	(100)
Net Intangible Assets	100	$ 100
Amortization Period		1 year
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Accumulated Amortization	(100)	$ (100)
Loan servicing rights
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	10,637	10,637	$ 6,671
Accumulated Amortization	(4,245)	(4,245)	(3,381)
Net Intangible Assets	6,392	6,392	3,290
Impairment loss reversal	(100)	(100)	300
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Accumulated Amortization	$ (4,245)	$ (4,245)	$ (3,381)
Loan servicing rights | Minimum
Finite-Lived Intangible Assets [Line Items]
Amortization Period		10 years	10 years
Loan servicing rights | Maximum
Finite-Lived Intangible Assets [Line Items]
Amortization Period		25 years	25 years